Quast 1948 Journal 48 May 3 Mullege 25°F Baja California great and eccentric rate of speed. At 9:00 P.M. I returned to find thrashing cockroaches 20 feet from the latrine and saw them climbing the walls of the building outside. The latrine walls, floor, and ceiling was one moving mass of the insects and they raised a great commotion as they rattled over the wood and dropped from the walls and ceiling. Two of us, regretfully, had to use the latrine and I guarantee that it is one of the most eerie and unusual ex- periences that one can undergo. At 10:00 P.M. they are thrashing about 50 feet from the latrine, a few coming into the room in which we are working. The commotion in the latrine is still terrific. May 4 Minimum temperature last night was 55°F. Caught last night in Museum special traps by Dr. Benson and Tevis were 1 ♂ Dipodomys merriami and 5 ♂ Perognathus spinatus. Murray had 50 traps out too but could not catch anything although several of his traps were sprung. Traps were set mainly in the lava rock fragments; the Dipodomys was captured in sand. ↑ Visited a bat cave about 1/2 mile up the canyon from the mission this afternoon. It is a natural cave that extends on an